Following extensive examinations over the last two days — including neurological tests this morning — Warriors’ guard Klay Thompson has been diagnosed with a concussion. He will not return to the court until he is symptom-free and cleared under the NBA’s concussion protocol guidelines. He will be evaluated daily and there is no timetable for his return.

During the fourth quarter of Game 5 against the Houston Rockets, Thompson was hit by a flying knee belonging to Rockets forward Trevor Ariza.

“After the game [Thompson] began to not feel well and developed concussion-like symptoms. He will continue to be evaluated by the team’s medical staff tonight,” the Warriors said in a post-game statement.

The final call on Thompson’s status will involve the NBA’s own doctors as well:

While the final return-to participation decision is to be made by the player’s team physician, the team physician must discuss the return-to-participation process and decision with Dr. Jeffrey Kutcher, the Director of the NBA’s Concussion Program, prior to the player being cleared for full participation in NBA Basketball.

With five days until the start of the NBA Finals, there’s a very real possibility the Warriors may have to start their series against the Cleveland Cavaliers without their second-best player.

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